In what type of location is Type TC-ER cable specifically required?

Type TC-ER (Tray Cable-Extended Length) cable is specifically required in Class III, Division 1 locations due to its design and capabilities that allow it to be used in environments where flammable fibers or flying materials may be present. Class III locations contain combustible dust, and Type TC-ER cables meet the standards for safety in these scenarios by being rugged and capable of withstanding environmental stresses.

This cable type is built for flexibility and durability, making it an appropriate choice for conditions that can include exposure to these hazardous materials, ensuring that any potential ignition sources are minimized.

The other classifications mentioned do not have the same specific requirements for using Type TC-ER cable. Class I, Division 2 locations pertain primarily to the presence of flammable gases, whereas Class II, Division 1 deals with environments rich in combustible dusts. Unclassified locations do not have hazardous conditions, thus no specific cable type like the TC-ER is mandated. Therefore, the suitability of Type TC-ER cable in Class III, Division 1 locations is clearly defined by its construction for safety and effectiveness in managing combustible dust hazards.